1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
timofeeve [1]
3 years ago
14

I cant solve this problem, and our teacher said that this would be in the test we'll have tomorrow, can someone help me?

Physics
1 answer:
Ad libitum [116K]3 years ago
3 0

Answer:

d = 11.1 m

Explanation:

Since the inclined plane is frictionless, this is just a simple application of the conservation law of energy:

\frac{1}{2} m {v}^{2}  = mgh

Let d be the displacement along the inclined plane. Note that the height h in terms of d and the angle is as follows:

\sin(15)  =  \frac{h}{d}  \\ or \: h = d \sin(15)

Plugging this into the energy conservation equation and cancelling m, we get

{v}^{2}  = 2gd \sin(15)

Solving for d,

d =  \frac{ {v}^{2} }{2g \sin(15) }  =  \frac{ {(7.5 \:  \frac{m}{s}) }^{2} }{2(9.8 \:  \frac{m}{ {s}^{2} })(0.259)}   \\ = 11.1 \: m

You might be interested in
I select true helllpppp me
yanalaym [24]

Answer:

your right answer is true

hope it helps you

3 0
3 years ago
Read 2 more answers
Question 2 of 20
alukav5142 [94]

Answer: a

Explanation: because i said so

8 0
2 years ago
Plss help im taking a quiz thx!!!
Iteru [2.4K]

Answer:

David

Explanation:

Because he is not on the ride with Ben and Justine

6 0
3 years ago
Read 2 more answers
Can I please have help
NeTakaya

Answer:

it will usually increase

Explanation:

potato

6 0
2 years ago
A common way to measure the distance to lightning is to start counting, one count per second, as soon as you see the flash. Stop
AURORKA [14]

Answer:

d = 1.07 mile

Explanation:

The rationale for this method is that the speed of light is much greater than the speed of sound, the definition of speed in uniform motion is  

v = d / t  

d = v t  

the speed of sound is worth  

v = 343 m / s  

Therefore, the speed of sound must be multiplied by time to do this, all the units must be in the same system, as the distance in miles is requested  

v = 343 m/s (1mile/1609 m) (3600s/1 h) = 343 (2.24) = 767.4 mile/h  

v = 343 m / s (1 mile / 1609 m) = 0.213, mile/ s  

If the measured time is t = 5s we multiply it by the speed  

we substitute  

d = 0.213 5

d = 1.07 mile

If you want to calculate the speed, this method in general is not widely used, since you must know the distance where the lightning occurred, which is relatively complicated.

8 0
3 years ago
Other questions:
  • Write a hypothesis about the effect of temperature and surface area on the rate of chemical reactions using this format: “If . .
    9·2 answers
  • Which involves reflection of light waves? A. A full moon shows sunlight bouncing off the moon's surface and traveling toward Ear
    8·2 answers
  • Which layer contains solid rock and magma
    8·1 answer
  • An amateur player is about to throw a dart with an initial velocity of 15 meters/second onto a dartboard that is at a distance o
    9·1 answer
  • What is the speed of a wave that has a wavelength of 0.4 m and a frequency of 10 Hz
    12·1 answer
  • The mass of a proton is approximately equal to
    7·1 answer
  • A tennis ball is tossed upwards into the air with an initial velocity of +5m/s, how much time does it take for the tennis ball t
    9·1 answer
  • Three children are sitting on a merry-go-round while a fourth child is pushing on the outside edge with a constant force. Why do
    10·1 answer
  • A brick of mass 5 kg is released from rest at a height of 3 m. How fast is it going when it hits the ground? Acceleration due to
    6·1 answer
  • After washing lettuce, you can dry the water from it using a salad spinner. You put the lettuce in the bowl, and then crank the
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!